LXR qemu/replay/replay-snapshot.c

   1/*
   2 * replay-snapshot.c
   3 *
   4 * Copyright (c) 2010-2016 Institute for System Programming
   5 *                         of the Russian Academy of Sciences.
   6 *
   7 * This work is licensed under the terms of the GNU GPL, version 2 or later.
   8 * See the COPYING file in the top-level directory.
   9 *
  10 */
  11
  12#include "qemu/osdep.h"
  13#include "qapi/error.h"
  14#include "sysemu/replay.h"
  15#include "replay-internal.h"
  16#include "monitor/monitor.h"
  17#include "qapi/qmp/qstring.h"
  18#include "qemu/error-report.h"
  19#include "migration/vmstate.h"
  20#include "migration/snapshot.h"
  21
  22static int replay_pre_save(void *opaque)
  23{
  24    ReplayState *state = opaque;
  25    state->file_offset = ftell(replay_file);
  26
  27    return 0;
  28}
  29
  30static int replay_post_load(void *opaque, int version_id)
  31{
  32    ReplayState *state = opaque;
  33    if (replay_mode == REPLAY_MODE_PLAY) {
  34        fseek(replay_file, state->file_offset, SEEK_SET);
  35        /* If this was a vmstate, saved in recording mode,
  36           we need to initialize replay data fields. */
  37        replay_fetch_data_kind();
  38    } else if (replay_mode == REPLAY_MODE_RECORD) {
  39        /* This is only useful for loading the initial state.
  40           Therefore reset all the counters. */
  41        state->instruction_count = 0;
  42        state->block_request_id = 0;
  43    }
  44
  45    return 0;
  46}
  47
  48static const VMStateDescription vmstate_replay = {
  49    .name = "replay",
  50    .version_id = 2,
  51    .minimum_version_id = 2,
  52    .pre_save = replay_pre_save,
  53    .post_load = replay_post_load,
  54    .fields = (VMStateField[]) {
  55        VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT),
  56        VMSTATE_UINT64(current_icount, ReplayState),
  57        VMSTATE_INT32(instruction_count, ReplayState),
  58        VMSTATE_UINT32(data_kind, ReplayState),
  59        VMSTATE_UINT32(has_unread_data, ReplayState),
  60        VMSTATE_UINT64(file_offset, ReplayState),
  61        VMSTATE_UINT64(block_request_id, ReplayState),
  62        VMSTATE_UINT64(read_event_id, ReplayState),
  63        VMSTATE_END_OF_LIST()
  64    },
  65};
  66
  67void replay_vmstate_register(void)
  68{
  69    vmstate_register(NULL, 0, &vmstate_replay, &replay_state);
  70}
  71
  72void replay_vmstate_init(void)
  73{
  74    Error *err = NULL;
  75
  76    if (replay_snapshot) {
  77        if (replay_mode == REPLAY_MODE_RECORD) {
  78            if (!save_snapshot(replay_snapshot,
  79                               true, NULL, false, NULL, &err)) {
  80                error_report_err(err);
  81                error_report("Could not create snapshot for icount record");
  82                exit(1);
  83            }
  84        } else if (replay_mode == REPLAY_MODE_PLAY) {
  85            if (!load_snapshot(replay_snapshot, NULL, false, NULL, &err)) {
  86                error_report_err(err);
  87                error_report("Could not load snapshot for icount replay");
  88                exit(1);
  89            }
  90        }
  91    }
  92}
  93
  94bool replay_can_snapshot(void)
  95{
  96    return replay_mode == REPLAY_MODE_NONE
  97        || !replay_has_events();
  98}
  99